LIGHT EMITTING DEVICE PACKAGE AND LIGHTING DEVICE FOR VEHICLE INCLUDING THE SAME

• US 20150062949A1
• Filed: 08/29/2014
• Published: 03/05/2015
• Est. Priority Date: 08/30/2013
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: LEE, Gun Kyo, PARK, In Yong, LEE, Dae Hee, CHO, Yun Min
• Granted Patent: US 9,269,861 B2
• Time in Patent Office: Days
• US Class Current: 362/520
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21S 43/26 Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material

Abstract

Embodiments relate to a light emitting device package including a package body, a light emitting structure disposed on the package body, the light emitting structure including a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer, the light emitting structure being divided into at least two light emitting cells, a support substrate located between the package body and the light emitting structure, a first electrode and a second electrode connected to each of the light emitting cells and fluorescent substances disposed respectively on the light emitting cells. At least two layers among the first conductive semiconductor layer, the active layer and the second conductive semiconductor layer included in each of the light emitting cells next to each other are electrically separated from each other.

Claims

1. A light emitting device package comprising:

a package body;

a light emitting structure disposed on the package body, the light emitting structure including a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer, the light emitting structure being divided into at least two light emitting cells;

a support substrate located between the package body and the light emitting structure;

a first electrode and a second electrode connected to each of the light emitting cells; and

fluorescent substances disposed respectively on the light emitting cells,

wherein at least two layers among the first conductive semiconductor layer, the active layer and the second conductive semiconductor layer included in each of the light emitting cells next to each other are electrically separated from each other.

2. The package according to claim 1, wherein the respective light emitting cells emit light of the same wavelength range, and at least some portions of the fluorescent substances disposed respectively on the light emitting cells emit light of different wavelength ranges.

3. The package according to claim 1, wherein the fluorescent substances take the form of a conformal coating or a film.

4. The package according to claim 1, wherein a distance of the light emitting cells next to each other is 10 μ

m to 50 μ

m.

5. The package according to claim 1, further comprising a substrate for placement of the light emitting structure,

wherein each of the light emitting cells is mesa-etched such that the second conductive semiconductor layer, the active layer and a portion of the first conductive semiconductor layer are etched to expose a portion of the first conductive semiconductor layer, and the second electrode and the first electrode are respectively disposed on the second conductive semiconductor layer in an unetched region and the exposed first conductive semiconductor layer in an etched region of the light emitting cell.

6. The package according to claim 5, further comprising a conductive support substrate for placement of the light emitting structure,

wherein the first electrode is disposed on the first conductive semiconductor layer of each of the light emitting cells.

7. A lighting device for a vehicle comprising:

a circuit board;

a light emitting device package disposed on the circuit board, the light emitting device package including;

a package body;

at least one light emitting structure disposed on the package body, the light emitting structure including a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer, the light emitting structure being divided into at least two light emitting cells;

a support substrate located between the package body and the light emitting structure;

a first electrode and a second electrode connected to each of the light emitting cells; and

fluorescent substances disposed respectively on the light emitting cells, wherein at least two layers among the first conductive semiconductor layer, the active layer and the second conductive semiconductor layer included in each of the light emitting cells next to each other are electrically separated from each other; and

a lens disposed on the light emitting device package,

wherein the at least one light emitting structure includes two or more light emitting structures, each of the light emitting structures is configured to emit light of a blue wavelength range, and the respective light emitting cells are provided with at least a yellow fluorescent substance and a red fluorescent substance.

8. The device according to claim 7, wherein each of the light emitting structures includes a first light emitting cell provided with the yellow fluorescent substance and a second light emitting cell provided with a red fluorescent substance, and the first light emitting cell and the second light emitting cell in the light emitting structure are equally arranged.

9. The device according to claim 7, wherein the first light emitting cell and the second light emitting cell are driven independently of each other.

10. A light emitting device package comprising:

a package body;

at least one light emitting structure disposed on the package body, the light emitting structure including a first conductive semiconductor layer, an active layer and a second conductive semiconductor layer, the light emitting structure being divided into at least two light emitting cells;

a first electrode and a second electrode connected to each of the light emitting cells; and

fluorescent substances disposed respectively on at least some portions of the light emitting cells,

wherein the light emitting cells differ from one another in terms of at least one of a shape of the cells and a distance between the cells.

11. The package according to claim 10, wherein the respective light emitting cells have a square shape or a triangular shape.

12. The package according to claim 10, wherein the active layers of the respective light emitting cells emit light of the same wavelength range, and at least some portions of the fluorescent substances disposed respectively on the light emitting cells emit light of different wavelength ranges.

13. The package according to claim 12, wherein the light emitting cells include a first light emitting cell provided with a first fluorescent substance to emit light of a first wavelength range and a second light emitting cell provided with a second fluorescent substance to emit light of a second wavelength range, and at least one of the first light emitting cell and the second light emitting cell indicates a specific emblem.

14. The package according to claim 10, wherein the light emitting cells having different shapes are provided with fluorescent substances to emit light of the same wavelength range or light of different wavelength ranges.

15. The package according to claim 10, wherein the light emitting cells having the same shape are provided with fluorescent substances to emit light of the same wavelength range or light of different wavelength ranges.

16. The package according to claim 10, wherein the light emitting cells are formed by growing a single light emitting structure and then dividing the grown light emitting structure via etching.

17. The package according to claim 10, wherein the fluorescent substances take the form of a conformal coating or a film.

18. The package according to claim 10, wherein a distance of the light emitting cells next to each other is 10 μ

m to 50 μ

m.

19. The package according to claim 10, wherein the at least one light emitting structure includes a first light emitting structure and a second light emitting structure, and some light emitting cells in the first light emitting structure and some light emitting cells in the second light emitting structure indicate a direction indicating emblem.

20. The package according to claim 19, wherein some light emitting cells in the first light emitting structure and some light emitting cells in the second light emitting structure indicate a break signal emblem.